Общий каталог Yamawa 2022 - 2023 - страница 1154

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Technical Description of productsInformation t Edge angle and Cutting allowance of taps ■Cutting angle and Chamfer relief angle θ : Cutting angle γ : Chamfer relief angle Chordal Hook Angle Rake Angle Tangential Hook Angle Cutting angle of hook face. The angle between the Cutting angle of rake face. The angle between the Cutting angle of hook face. The angle between the center line passing the cutting edge and the straight center line passing the cutting edge and the straight center line passing the cutting edge and the straight line linking the cutting edge with the thread root. line linking the cutting edge with thread root. line tangent to the rake face on the cutting edge. ■Thread relief S : Indicator drop for thread relief Concentric-unrelieved Con-eccentric thread relief Eccentric thread relief No relief exists at land. Start (A) and heel (B) of Radial relief in the thread form starts at the back of Radial relief in the thread form starts at the cutting thread land have same concentricity. a concentric margin. edge and continues to the heel. ■The amount of cut portion Land A Please refer to the pictures shown. In such taps as have 4 utes and 3 thread chamfer, the Land D cutting operation progresses in order from the edge of A1, B1, C1, D1…A2, B2…A4. Tap end is usually smaller Land B Land A than the size of bored hole, and A1 may not make any cutting operation. Land C Land B t : Amount of cut portion per blade Land C Land D Tapping direction Bored hole diameter Technical-3